alleryStart learning →A pattern begins 3, 7, 11, 15. Which number continues it?
- 19
- 18
- 21
- 20
Show answer and solution
Correct answer: A. 19
Each term rises by 4, so 15 + 4 = 19.
CA Foundation Number Series, Coding and Decoding — practice questions
Explore 67 free Number Series, Coding and Decoding questions in CA Foundation Quantitative Aptitude. Open each question or exercise to read its content, reference answers and available explanation.
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Showing questions 1–30 of 67.
A pattern begins 3, 7, 11, 15. Which number continues it?Read the answer and worked solution →Which number should follow 2, 6, 18, 54 to keep the pattern going?Read the answer and worked solution →Complete the pattern 1, 1, 2, 3, 5, 8 with the number that comes next.Read the answer and worked solution →The list 2, 3, 5, 7, 11 continues with which number?Read the answer and worked solution →A tank level reads 100, 92, 84, 76 litres in turn. What is the next reading?Read the answer and worked solution →Dots are stacked as 1, 3, 6, 10, 15 in successive layers. How many in the next stack?Read the answer and worked solution →Cell counts are 5, 10, 20, 40 on successive days. What is the count on the next day?Read the answer and worked solution →What is the next cube after 1, 8, 27 and 64?Read the answer and worked solution →What number comes after 3, 6, 11, 18, 27 in this pattern?Read the answer and worked solution →Work out the term after 2, 5, 10, 17, 26 in the series.Read the answer and worked solution →The series 0, 2, 6, 12, 20 goes on with which number?Read the answer and worked solution →Which term completes 4, 9, 19, 39 in the same rule?Read the answer and worked solution →A ball bounces to heights 81, 27, 9, 3 cm in turn. What is the next height in cm?Read the answer and worked solution →Weekly savings follow 7, 14, 28, 56 rupees. What does the pattern give for the next week?Read the answer and worked solution →Which value follows 1, 2, 6, 24, 120 in the series?Read the answer and worked solution →Find what comes next in the sequence 2, 6, 12, 20, 30.Read the answer and worked solution →What prime number extends the run 11, 13, 17, 19, 23?Read the answer and worked solution →Distances in km run 15, 16, 18, 21, 25 on successive days. What is the next one?Read the answer and worked solution →Each number is the sum of the two before: 2, 3, 5, 8, 13. What is the following number?Read the answer and worked solution →Give the number that follows 5, 6, 8, 11, 15 in this rule.Read the answer and worked solution →A mass of 1000 g is halved repeatedly: 1000, 500, 250, 125. What comes next?Read the answer and worked solution →What term follows 3, 5, 9, 17, 33 if the gaps keep doubling?Read the answer and worked solution →Name the term after 1, 2, 3, 5, 8, 13, 21 in the Fibonacci pattern.Read the answer and worked solution →Which number should replace the question mark after 2, 12, 36, 80, 150?Read the answer and worked solution →What is the next number when the list is 1, 3, 7, 15, 31?Read the answer and worked solution →A loan grows by half each year: 4, 6, 9, 13.5 lakh. What is the next value?Read the answer and worked solution →Each term is 1.5 times the one before it: 8, 12, 18, 27. Which term is next?Read the answer and worked solution →Continue the list 3, 8, 15, 24, 35 by one more entry.Read the answer and worked solution →Room numbers on a floor go 9, 19, 29, 39. What is the next room number?Read the answer and worked solution →What is the 20th term of the series 3, 7, 11, 15, ...?Read the answer and worked solution →
Worked practice questions
Which number should follow 2, 6, 18, 54 to keep the pattern going?
- 148
- 162
- 216
- 108
Show answer and solution
Correct answer: B. 162
Every term is multiplied by 3, so 54 x 3 = 162.
Complete the pattern 1, 1, 2, 3, 5, 8 with the number that comes next.
- 12
- 13
- 11
- 14
Show answer and solution
Correct answer: B. 13
Each term is the sum of the two before it, so 5 + 8 = 13.
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